Thanks for responding to the thread Stephen. John Colclough Mercier (1813-1864) was my 4xgreat grandfather. My great grandmother on my maternal side was a Mercier (Eleanor Vyvyan), daughter of Maunsell Mercier, grand-daughter of Charles Mercier.
I am intrigued to know your lineage to John Colclough Mercier. If you would prefer my email is firstname.lastname@example.org